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Research on Key Technologies to Improve Cementing Displacement Efficiency. [PDF]
ACS Omega, 2022 The annulus has a wide and narrow clearance due to casing eccentricity in the cementing process and due to the eccentricity of casing in the process of cementing. Because the flow resistance of the drilling fluid in the wide gap is less than that in the narrow gap, the phenomena of a delayed flow or even an overall nonflow occurs in the narrow gap ...
Wang J +6 more
europepmc +3 more sources
Study on crude oil displacement efficiency by fracturing fluid in tight sandstone reservoir. [PDF]
PLoS ONETight sandstone reservoirs usually experience a long flowback period after hydraulic fracturing, which significantly affects oil production. After fracturing, the well-soaking is commonly employed to control fracturing fluid flowback and enhance oil ...
Jinfeng Li +6 more
doaj +2 more sources
Polymer flooding – Does Microscopic Displacement Efficiency Matter?
Revista Fuentes El Reventón Energético, 2018 Polymer flooding is an enhanced oil recovery (EOR) technique that aims to enhance the stability of the flood front in order to increase sweep efficiency and thereby increase hydrocarbon recovery. Polymer flooding studies often focus on large-scale sweep
Guangyuan Sun +9 more
doaj +3 more sources
Petroleum Exploration and Development, 2021 Waterflooding experiments were conducted in micro-models (microscopic scale) and on plunger cores from low permeability, extra-low permeability and ultra-low permeability reservoirs in the Ordos Basin under different displacement pressures using the NMR ...
Wenlian XIAO +9 more
doaj +1 more source
Effects of cosolvents on CO2 displacement of shale oil and carbon storage
Petroleum Exploration and Development, 2023 Molecular dynamics method was used to establish composite wall/inorganic nanopores of three pore sizes, three shale oil systems, five CO2-cosolvent systems, and pure CO2 system.
Yifan ZHANG +7 more
doaj +1 more source
Energies, 2022 An amount of oil remains in oil reservoirs even at the high water-cut stage of produced liquid from oil wells. To reveal the mechanism of displacement rates to affect the remaining oil in pore scales, a two-dimensional (2D) glass etching pore network ...
Lingwen Meng, Binshan Ju
doaj +1 more source
Energies, 2022 The depletion of conventional oil reserves creates a significant demand for the development and improvement of methods and technologies for the production of hard-to-recover oil.
Aleksandra Palyanitsina +4 more
doaj +1 more source
Numerical Simulation on the Safety and Quality of Cementing by Using Pad Fluid in Horizontal Wells
Energies, 2023 The failure of wellbore sealing will cause leakage of greenhouse gases, such as carbon dioxide and methane, which will harm oil and gas recovery and environmental safety. Cementing is an important part of wellbore sealing.
Ben Qi +6 more
doaj +1 more source
Frontiers in Earth Science, 2021 Residual oil distribution plays a critical role in understanding of the CO2 flooding processes, but its quantitative research for reservoirs with different permeability levels rarely has been comprehensively conducted in the laboratory.
Ying Yang +9 more
doaj +1 more source
Journal of Groundwater Science and Engineering, 2021 In order to maintain the production rate of a reservoir and improve the displacement efficiency, it is crucial to have an in-depth understanding of the process of oil displacement by water.
Fei Gao, Feng Liu, Hua-jun Wang
doaj +1 more source